Design Rules for High Damping in Mobile Hydraulic Systems

Mikael Axin
Division of Fluid and Mechatronic Systems, Department of Management and Engineering, Linköping University, Sweden

Petter Krus
Division of Fluid and Mechatronic Systems, Department of Management and Engineering, Linköping University, Sweden

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp1392a2

Ingår i: 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Linköping Electronic Conference Proceedings 92:2, s. 13-20

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Publicerad: 2013-09-09

ISBN: 978-91-7519-572-8

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


This paper analyses the damping in pressure compensated closed centre mobile working hydraulic systems. Both rotational and linear loads are covered and the analysis applies to any type of pump controller. Only the outlet orifice in the directional valve will provide damping to a pressure compensated system. Design rules are proposed for how the system should be dimensioned in order to obtain a high damping. The volumes on each side of the load have a high impact on the damping. In case of a small volume on the inlet side; the damping becomes low. However; the most important thing is to design the outlet orifice area properly. There exists an optimal orifice dimension for maximized damping; both smaller and larger orifice areas give lower damping independently of the volumes. This paper presents a method to dimension the outlet orifice area and the load volumes in order to obtain a desired system damping. Experimental results; which confirm the theoretical expectations; are also presented. The conclusions are that it is possible to obtain a high damping contribution from the outlet orifice if the system is dimensioned correctly. However; the energy efficiency needs to be considered while improving the damping


Damping; compensator; outlet orifice; efficiency


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